2017
DOI: 10.1021/acs.jpcc.7b01314
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Efficient Organic Photovoltaics with Improved Charge Extraction and High Short-Circuit Current

Abstract: Exciton generation, dissociation, free carrier transport, and charge extraction play an important role in the short-circuit current (J sc) and power conversion efficiency of an organic bulk heterojunction (BHJ) solar cell (SC). Here we study the impact of band offset at the interfacial layer and the morphology of active layer on the extraction of free carriers. The effects are evaluated on an inverted BHJ SC using zinc oxide (ZnO) as a buffer layer, prepared via two different methods: ZnO nanoparticle disperse… Show more

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Cited by 32 publications
(20 citation statements)
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“…This indicates that the ETL surface roughness may also affect the morphology of the active layer. [28] The change in the film quality can also be seen by SEM (Figure 2a-c). In Figure 2a, the pure ZnO NP ETL shows a poorly packed, non-uniform assembly of the ZnO NPs.…”
Section: Resultsmentioning
confidence: 79%
See 1 more Smart Citation
“…This indicates that the ETL surface roughness may also affect the morphology of the active layer. [28] The change in the film quality can also be seen by SEM (Figure 2a-c). In Figure 2a, the pure ZnO NP ETL shows a poorly packed, non-uniform assembly of the ZnO NPs.…”
Section: Resultsmentioning
confidence: 79%
“…Dispersions of ZnO nanoparticles (NPs) can be used to produce ETLs with thicknesses >100 nm [27] without the use of high temperature thermal annealing. [28] However, in comparison to the solgel ZnO, the size of the ZnO NPs is much larger which may lead to larger interstitial regions between the NPs and pinholes in the film that deleteriously effects electron mobility and makes the active layer more susceptible to the effects of water and oxygen. [29] In addition, any aggregation of the NPs in the dispersion and the deposition of the hydrophilic NPs on a hydrophobic surface, that could result in dewetting, would lead to non-uniformities in the films, and reduced carrier extraction efficiency from active layer to ETL.…”
Section: Introductionmentioning
confidence: 99%
“…23,24 Additionally, they create adsorption sites for environmental oxygen and water molecules, which are highly detrimental to device stability. 25,26 Consequently, the surface defect passivation strategy of ZnO has become vital concurrently in enhancing the PCE and the sustainability of inverted OSCs.…”
Section: Introductionmentioning
confidence: 99%
“…It should be noted that replacing PEDOT:PSS with metal oxide based HTLs typically lead to a reduction of R s resulting in better efficiency . Mohan et al . reported the fabrication of 5.6% efficiency cell with P3HT:PC 71 BM by using this strategy.…”
Section: Resultsmentioning
confidence: 99%